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Differential Test Fixture Calibration

Question asked by dwhong on Mar 24, 2008
Latest reply on Mar 31, 2008 by RayH
Hello,

We want to use a Network Analyzer to measure S-Parameters directly at the ball of our device (IC). Since the device I/O is differential, the PCB trace is also implemented in differential way (i.e. there should be coupling between feedlines of the test fixture).
However, all the calibration standards and error correction algorithms are based on single mode transmission theory.

What's the best way to measure the S-parameter of DUT excluding all the test fixture effects which include differential PCB trace to the DUT?
Is there any available calibration method for differential trace?  

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